The weekly rentals for a newly released DVD of an animated film at a local video store decreased each week. At the same time, the weekly rentals for a newly released DVD of a horror film increased each week. Models that approximate the weekly rentals R for each DVD are
?
?
where x represents the number of weeks each DVD was in the store, with x = 1 corresponding to the first week. After how many weeks will the rentals for the two movies be equal?
?
A. 10 weeks
B. 6 weeks
C. 4 weeks
D. 12 weeks
E. 8 weeks
Answer: E
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If a rock falls near the surface of Earth, it has a constant downward acceleration of 9.8 meters per second per second. If V is the downward velocity, in meters per second, of the rock after t seconds, then V satisfies which equation of change? ?
A. 
B. 
C. 
D. 
Multiply or divide (as specified) the numerator and denominator by the given factor to obtain an equivalent fraction.
(multiply by 5x2z2)
A. 
B. 5x3yz1
C. 5x1yz3
D. 
Solve the problem.In a certain city, the cost of a taxi ride is computed as follows: There is a fixed charge of $2.30 as soon as you get in the taxi, to which a charge of $2.40 per mile is added. Find an equation that can be used to determine the cost, C(x), of an x-mile taxi ride.
A. C(x) = 2.40 + 2.30x B. C(x) = 2.30 + 2.40x C. C(x) = 3.20x D. C(x) = 4.70x
Differentiate.y = 4ex2
A. 8xe4x2 B. 8xe2x C. 8xex2 D. 8xe